Evaluates the hillshade, considering the sunlight and the shaded relief.
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<h3>Inputs</h3>
<ul>      
<li>the file containing the matrix of the elevations, usually the DEM or the output of pitfiller </li>
<li>the minimum diffuse insolation (which default value is set to 0)</li>
<li>the azimuth (which default value is setted to 360)</li>
<li>the elevation of the sun (which default value is set to 90)</li>
</ul>
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<h3>Output</h3>
<ul>      
<li>the matrix containing the hillshade values</li>
</ul>